CN112606162B - Preparation process of moisture-proof fiberboard - Google Patents
Preparation process of moisture-proof fiberboard Download PDFInfo
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- CN112606162B CN112606162B CN202011465241.5A CN202011465241A CN112606162B CN 112606162 B CN112606162 B CN 112606162B CN 202011465241 A CN202011465241 A CN 202011465241A CN 112606162 B CN112606162 B CN 112606162B
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- sand blasting
- adjusting
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- pipe assembly
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N1/00—Pretreatment of moulding material
- B27N1/02—Mixing the material with binding agent
- B27N1/0209—Methods, e.g. characterised by the composition of the agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
- B27N3/14—Distributing or orienting the particles or fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Mechanical Engineering (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention discloses a preparation process of a moisture-proof fiberboard, which comprises the following steps: cutting pine, weed wood and mountain pepper into slices by a chipping machine; adding slices and folium Piperis Kadsurae into a hot mill, steaming, adding molten paraffin, hot milling to defibrate, wherein the pressure in the hot mill is 8-8.5bar, and the steaming time is 3-4 min; wherein the amount of the mountain pepper leaf is 10% -16% of the amount of the flake, and the addition amount of the paraffin is 7-10kg/m3(ii) a Adding adhesive and molten epoxy resin into the hot-milled fiber, wherein the addition amount of the adhesive is 70-100kg/m3The addition amount of the epoxy resin is 60-90kg/m3(ii) a Drying the sizing fiber, sorting, paving and forming the dried sizing fiber, and then pressing the sizing fiber by a press to obtain the finished product; uniformly colliding a plurality of grooves on the surface of the pressed fiber board by adopting a sand blasting machine, and then uniformly spraying a protective layer on the surface of the fiber board; compared with the prior art, the prepared fiberboard has low formaldehyde emission and has the mosquito repelling effect.
Description
Technical Field
The invention relates to the technical field of fiberboard manufacturing, in particular to a preparation process of a moisture-proof fiberboard.
Background
Fiberboard is one type of board material. The raw materials can be divided into fiber fiberboard, plywood fiberboard, wood shaving fiberboard and the like. The fiber fiberboard is made by soaking wood, branches and other objects in water, crushing and pressing, and is an artificial board made of wood fiber or other plant fibers as raw materials and applying an adhesive. Wood wool fiber boards are manufactured from particles of wood or other lignocellulosic materials, which are glued under heat and pressure to form an artificial board after the application of a glue. Also known as particle board. It is mainly used in furniture and building industry and train and automobile carriage manufacture.
However, the currently prepared fiberboard has the following drawbacks:
1. the adhesive is excessively relied on to improve the bonding strength and density, so that the content of formaldehyde exceeds the standard;
2. the adhesion force of the protective layer sprayed on the surface of the fiber board is poor.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a preparation process of a moisture-proof fiberboard, so as to solve the problems that the protective layer of the prepared fiberboard is poor in adhesive force and the formaldehyde content exceeds the standard in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: a preparation process of a moisture-proof fiberboard comprises the following steps:
a, cutting pine, miscellaneous tree and mountain pepper tree into slices by a chipping machine;
b, adding the slices and the mountain pepper leaves into a hot mill for cooking, adding molten paraffin into the hot mill for hot milling and defibrination, wherein the cooking pressure in the hot mill is 8-8.5bar, and the cooking time is 3-4 min; wherein the amount of the mountain pepper leaf is 10% -16% of the amount of the flake, and the addition amount of the paraffin is 7-10kg/m3；
Step c, adding adhesive and epoxy resin in a molten state into the hot-milled fibers, wherein the addition amount of the adhesive is 70-100kg/m3The addition amount of the epoxy resin is 60-90kg/m3；
D, drying the sizing fiber, sorting, paving and forming after drying, and pressing by a press to obtain the sizing fiber;
and e, uniformly colliding the pressed fiber board with a plurality of grooves on the board surface of the fiber board by adopting a sand blasting machine, and then uniformly spraying a protective layer on the board surface of the fiber board.
Preferably, after the step a is completed, the high-quality thin slices with the length of 22-28 mm, the thickness of 3-5 mm and the width of 20-24 mm are screened out by a screening machine.
Preferably, the adhesive is prepared by reacting excessive melamine with formaldehyde and glycerol in an acidic environment.
Preferably, the press in step d is completed under the following pressure and temperature conditions: firstly, the pressure is increased to 3.5 +/-0.3N/mm within 35-40s2Heating to 220 + -5 deg.C, maintaining the pressure for 70-90s, and reducing the pressure to 3.0 + -0.3N/mm within 16-18s2Increasing the temperature to 225 +/-5 ℃, maintaining the pressure for 100-2The temperature is reduced to 220 +/-5 ℃, then the pressure is maintained for 110-120s, and then the pressure is reduced to 2.0 +/-0.3N/mm in 24-26s2The temperature is reduced to 190 +/-5 ℃, the pressure is maintained for 140s, and finally the pressure is reduced to 0.6-0.8N/mm within 18-20s2And the temperature is reduced to 160 +/-5 ℃, and the pressure is maintained for 200 seconds and 300 seconds.
Preferably, the sand blasting machine adopted in the step e comprises a base table and a sealing cover arranged above the base table, wherein a discharge hole is formed in the middle of the base table along the width direction of the base table, material holes are formed in the sealing cover along the bottoms of two side walls of the base table in the length direction, and a sealing plate is arranged in each material hole in a sliding manner along the height direction; a lower sand blasting pipe assembly is arranged in the material discharge hole along the width direction of the base table, and an upper sand blasting pipe assembly arranged along the width direction of the base table is arranged above the lower sand blasting pipe assembly in the sealing cover; the sand pushing plate is connected to the inner wall of the sealing cover through telescopic rods arranged in the vertical direction and arranged in the width direction of the base table, and the sand pushing plate is located above the discharge hole and located on one side of the upper sand blasting pipe assembly.
Optimally, the upper sand blasting pipe assembly and the lower sand blasting pipe assembly are identical in structure and symmetrically arranged, the upper sand blasting pipe assembly comprises sand blasting adjusting pipes arranged along the width direction of the base platform, two ends of each sand blasting adjusting pipe are sealed, a plurality of spray heads are uniformly distributed and communicated at the bottoms of the sand blasting adjusting pipes along the length direction of the sand blasting adjusting pipes, and an adjusting structure is arranged between the sand blasting adjusting pipes of the upper sand blasting pipe assembly and the sand blasting adjusting pipes of the lower sand blasting pipe assembly; the adjustment structure is used for controlling the service conditions of a plurality of spray heads of the upper sand blasting pipe assembly and the lower sand blasting pipe assembly.
Preferably, the adjusting structure comprises adjusting parts and a driving part, wherein the adjusting parts are arranged in the sand blasting adjusting pipe of the upper sand blasting pipe assembly and the sand blasting adjusting pipe of the lower sand blasting pipe assembly respectively, the driving part is connected between the two adjusting parts, the middle part of each sand blasting adjusting pipe is communicated with a feeding pipe, each adjusting part comprises an adjusting screw rod which is rotatably arranged in the sand blasting adjusting pipe along the axial direction of the adjusting screw rod, and two ends in the sand blasting adjusting pipe are slidably clamped with a disconnecting adjusting block along the axial direction of the adjusting screw rod, and the two disconnecting adjusting blocks are in threaded connection with the adjusting screw rod; the driving part is connected with the adjusting screw rod in each adjusting part to enable the adjusting screw rods to rotate in the same direction, and the adjusting screw rods rotate to enable the two disconnected adjusting blocks connected with the adjusting screw rods to move in the opposite direction or in the opposite direction.
The optimized driving part comprises a driving belt wheel which is rotatably arranged on the outer wall of the sealing cover and a driven belt wheel which is fixedly connected with each adjusting screw rod, the driven belt wheels are rotatably arranged on the outer wall of the sealing cover, and the driving belt wheels are connected with each driven belt wheel through the same belt in a transmission manner.
Preferably, the adjusting screw rods comprise left half sections and right half sections which are reversely arranged in a threaded manner, and the two disconnecting adjusting blocks connected to each adjusting screw rod are correspondingly connected with the left half sections and the right half sections of each adjusting screw rod one by one.
Preferably, one side of the sand pushing plate, which is close to the upper sand blasting pipe assembly, is provided with an inclined plane, and the distance between the lower end of the inclined plane and the discharge hole is smaller than the distance between the high end of the inclined plane and the discharge hole.
Compared with the prior art, the invention has the following beneficial effects:
1. the preparation process of the moisture-proof fiberboard combines the adhesive and the epoxy resin to provide bonding strength for the hot-ground fiber, so that the prepared fiberboard can have enough structural strength, and the addition of the epoxy resin reduces the use of the adhesive, thereby reducing the release of formaldehyde content and ensuring that the formaldehyde release amount of the fiberboard prepared by the preparation process reaches E1;
2. the preparation process of the moisture-proof fiberboard enables the prepared fiberboard to have enough density, so that the fiberboard has certain moisture-proof performance, meanwhile, the protective layer also enhances the moisture-proof performance of the fiberboard, and the sand blasting machine is adopted to knock out a plurality of grooves on the surface of the fiberboard, so that the surface roughness of the fiberboard is enhanced, and the adhesive capacity of the protective layer on the fiberboard is improved;
3. the addition of the mountain pepper tree and the mountain pepper leaves in the preparation process of the moisture-proof fiberboard not only provides preparation raw materials for obtaining fibers in the fiberboard, but also can extract citronellal in the mountain pepper tree and the mountain pepper leaves to be added into the fiberboard, so that the fiberboard has a certain mosquito repellent effect.
Drawings
FIG. 1 is a schematic diagram of a sandblasting machine according to an embodiment of the present invention;
FIG. 2 is a front cross-sectional view of FIG. 1;
fig. 3 is a cross-sectional view of the blast adjusting pipe of fig. 1 taken along line a-a.
Detailed Description
The present invention will be described in further detail below by way of specific embodiments:
reference numerals in the drawings of the specification include: the device comprises a base table 1, a sealing cover 2, a discharge hole 3, a sealing plate 4, an expansion link 5, a sand pushing plate 6, a sand blasting adjusting pipe 7, a spray head 8, an adjusting screw rod 9, a disconnection adjusting block 10, a driving belt wheel 11, a driven belt wheel 12 and a material collecting groove 13.
Example 1
The embodiment of the invention provides a preparation process of a moisture-proof fiberboard, which comprises the following steps:
a, cutting pine, miscellaneous tree and mountain pepper tree into slices by a chipping machine; screening high-quality slices with the length of 22-28 mm, the thickness of 3-5 mm and the width of 20-24 mm by using a screening machine; fibers formed by the screened high-quality slices after cooking have certain length, and can be criss-cross in the pressing process to form a net structure, so that the structural strength of the prepared fiberboard is improved;
b, adding the slices and the mountain pepper leaves into a hot mill for cooking, adding molten paraffin, and performing hot milling for defibration, wherein the cooking pressure in the hot mill is 8bar, and the cooking time is 3 min; wherein the amount of folium Piperis Futokadsurae is 10% of the amount of sheet, and the addition amount of paraffin is 7kg/m3；
Step c, adding an adhesive and the epoxy resin in a molten state into the hot-milled fibers, wherein the addition amount of the adhesive is 70kg/m3The addition amount of the epoxy resin is 60kg/m3(ii) a Wherein, the adhesive is prepared by the reaction of excessive melamine, formaldehyde and glycerol in an acid environment; the adhesive can be provided by adding citric acid under an acidic environment, so that melamine, formaldehyde and glycerol react to prepare a water-soluble adhesive to provide bonding capability for the hot-milled fibers; excessive melamine is adopted to ensure that formaldehyde can fully react, and the content of formaldehyde in the prepared fiberboard is reduced;
d, drying the sizing fiber, sorting, paving and forming after drying, and pressing by a press to obtain the sizing fiber; the press was completed under the following pressure and temperature conditions: the pressure is first raised to 3.2N/mm in 35s2The temperature is increased to 215 ℃, the pressure is maintained for 70s, and then the pressure is reduced to 2.7N/mm in 16s2Increasing the temperature to 220 ℃, maintaining the pressure for 100s, and then reducing the pressure to 2.2N/mm in 20s2Cooling to 215 deg.C, maintaining the pressure for 110s, and reducing the pressure to 1.7N/mm in 24s2Cooling to 185 deg.C, maintaining the pressure for 130s, and reducing the pressure to 0.6N/mm in 18s2Cooling to 155 deg.C, and maintaining the pressure for 200 s; in the process of pressing the fiber, the temperature and the pressure are continuously changed, and the lifting speed of the temperature and the pressure are changed at the same time, so that the density of the prepared fiber board is improved, the fiber board has enough structural strength and moisture resistance, and most of formaldehyde is quickly volatilized, so that the formaldehyde emission in the prepared fiber board reaches the E1 standard;
e, uniformly colliding a plurality of grooves on the surface of the fiber board by the pressed fiber board by using a sand blasting machine, and then uniformly spraying a protective layer on the surface of the fiber board; the protective layer can be a waterproof and fireproof layer.
Example 2
The embodiment of the invention provides a preparation process of a moisture-proof fiberboard, which comprises the following steps:
a, cutting pine, miscellaneous tree and mountain pepper tree into slices by a chipping machine; screening high-quality slices with the length of 22-28 mm, the thickness of 3-5 mm and the width of 20-24 mm by using a screening machine;
step b, adding the slices and the mountain pepper leavesSteaming in a hot mill, adding molten paraffin, hot-milling and defibrating, wherein the steaming pressure in the hot mill is 8.5bar, and the steaming time is 4 min; wherein the amount of folium Piperis Futokadsurae is 16% of the amount of the sheet, and the addition amount of paraffin is 10kg/m3；
Step c, adding an adhesive and the epoxy resin in a molten state into the hot-milled fibers, wherein the addition amount of the adhesive is 100kg/m3The amount of the epoxy resin added was 90kg/m3(ii) a Wherein, the adhesive is prepared by the reaction of excessive melamine, formaldehyde and glycerol in an acid environment;
d, drying the sizing fiber, sorting, paving and forming after drying, and pressing by a press to obtain the sizing fiber; the press was completed under the following pressure and temperature conditions: the pressure is first raised to 3.8N/mm within 40s2Increasing the temperature to 225 ℃, maintaining the pressure for 90s, and then reducing the pressure to 3.3N/mm in 18s2Increasing the temperature to 230 ℃, maintaining the pressure for 110s, and then reducing the pressure to 2.8N/mm in 22s2Cooling to 225 deg.C, maintaining the pressure for 120s, and reducing the pressure to 2.3N/mm in 26s2Cooling to 195 deg.C, maintaining the pressure for 140s, and reducing the pressure to 0.8N/mm within 20s2Cooling to 165 ℃, and maintaining the pressure for 300 s;
e, uniformly colliding a plurality of grooves on the surface of the fiber board by the pressed fiber board by using a sand blasting machine, and then uniformly spraying a protective layer on the surface of the fiber board; the protective layer can be a waterproof and fireproof layer.
Example 3
The embodiment of the invention provides a preparation process of a moisture-proof fiberboard, which comprises the following steps:
a, cutting pine, miscellaneous tree and mountain pepper tree into slices by a chipping machine; screening high-quality slices with the length of 22-28 mm, the thickness of 3-5 mm and the width of 20-24 mm by using a screening machine;
b, adding the slices and the mountain pepper leaves into a hot mill for cooking, adding molten paraffin, and performing hot milling for defibration, wherein the cooking pressure in the hot mill is 8.3bar, and the cooking time is 3.6 min; wherein the amount of folium Piperis Futokadsurae is 13% of the amount of the sheet, and paraffinIs added in an amount of 8kg/m3；
Step c, adding an adhesive and the epoxy resin in a molten state into the hot-milled fibers, wherein the addition amount of the adhesive is 80kg/m3The addition amount of the epoxy resin is 70kg/m3(ii) a Wherein, the adhesive is prepared by the reaction of excessive melamine, formaldehyde and glycerol in an acid environment;
d, drying the sizing fiber, sorting, paving and forming after drying, and pressing by a press to obtain the sizing fiber; the press was completed under the following pressure and temperature conditions: the pressure is first raised to 3.5N/mm in 38s2Increasing the temperature to 220 ℃, maintaining the pressure for 80s, and then reducing the pressure to 3.0N/mm in 17s2Increasing the temperature to 225 ℃, maintaining the pressure for 105s, and then reducing the pressure to 2.5N/mm in 21s2Cooling to 220 deg.C, maintaining the pressure for 116s, and reducing the pressure to 2.0N/mm in 25s2Cooling to 190 deg.C, maintaining the pressure for 135s, and reducing the pressure to 0.7N/mm in 19s2Cooling to 160 ℃, and maintaining the pressure for 260 s;
e, uniformly colliding a plurality of grooves on the surface of the fiber board by the pressed fiber board by using a sand blasting machine, and then uniformly spraying a protective layer on the surface of the fiber board; the protective layer can be a waterproof and fireproof layer.
Comparative example 1
The embodiment of the invention provides a preparation process of a moisture-proof fiberboard, which comprises the following steps:
a, cutting pine and miscellaneous tree into thin slices by a chipping machine; screening high-quality slices with the length of 22-28 mm, the thickness of 3-5 mm and the width of 20-24 mm by using a screening machine;
b, adding the slices into a hot mill for cooking, adding molten paraffin into the hot mill for defibering, wherein the cooking pressure in the hot mill is 8.3bar, and the cooking time is 3.6 min; wherein the amount of folium Piperis Futokadsurae is 13% of the amount of the sheet, and the addition amount of paraffin is 8kg/m3；
Step c, adding an adhesive and the epoxy resin in a molten state into the hot-milled fibers, wherein the addition amount of the adhesive is 80kg/m3Addition amount of epoxy resinIs 70kg/m3(ii) a Wherein, the adhesive is prepared by the reaction of excessive melamine, formaldehyde and glycerol in an acid environment;
d, drying the sizing fiber, sorting, paving and forming after drying, and pressing by a press to obtain the sizing fiber; the press was completed under the following pressure and temperature conditions: the pressure is first raised to 3.5N/mm in 38s2Increasing the temperature to 220 ℃, maintaining the pressure for 80s, and then reducing the pressure to 3.0N/mm in 17s2Increasing the temperature to 225 deg.C, maintaining the pressure for 105s, and reducing the pressure to 2.5N/mm in 21s2Cooling to 220 deg.C, maintaining the pressure for 116s, and reducing the pressure to 2.0N/mm in 25s2Cooling to 190 deg.C, maintaining the pressure for 135s, and reducing the pressure to 0.7N/mm in 19s2Cooling to 160 ℃, and maintaining the pressure for 260 s;
e, uniformly colliding a plurality of grooves on the surface of the fiber board by the pressed fiber board by using a sand blasting machine, and then uniformly spraying a protective layer on the surface of the fiber board; the protective layer can be a waterproof and fireproof layer.
The fiber sheets prepared by examples 1 to 3 were subjected to the physical and chemical property tests as shown in table 1:
| item | Example 1 | Example 2 | Example 3 | International requirements for |
| Density (kg/m)3) | 798 | 800 | 798 | 650-800 |
| Water absorption thickness expansion ratio (%) | 12 | 8 | 9 | ≤30 |
| Modulus of elasticity (MPa) | 4260 | 4392 | 4315 | ≥2800 |
| Formaldehyde emission (mg/100g) | 3 | 6 | 5 | ≤9 |
| Static bending strength (MPa) | 41.8 | 43.5 | 42.3 | ≥28 |
TABLE 1
As can be seen from the detection data in Table 1, the density of the fiber board prepared by the preparation process of the moisture-proof fiber board meets the international requirement, the water absorption thickness expansion rate is obviously lower than the international requirement, the elastic modulus and the static bending strength are obviously higher than the international requirement, and the formaldehyde emission reaches the E1 standard.
In summer, the fiber boards prepared in the examples 1 to 3 and the comparative example 1 are placed in different rooms in the same environment, the windows of the rooms are opened, the fiber boards prepared in the examples 1 to 3 are placed in the rooms without mosquitoes, and a large amount of mosquitoes fly into the room in which the fiber board prepared in the comparative example 1 is placed, so that the fiber board prepared by the preparation process of the moisture-proof fiber board has a good mosquito repelling effect.
Example 4
The sand blasting machines adopted in the embodiments 1 to 3 and the comparative example 1 respectively comprise a base table 1 and a sealing cover 2 arranged above the base table 1, wherein a discharge hole 3 is formed in the middle of the base table 1 along the width direction of the base table, material holes are formed in the sealing cover 2 along the bottoms of two side walls of the base table 1 in the length direction, and a sealing plate 4 is arranged in each material hole in a sliding manner along the height direction; a lower sand blasting pipe assembly is arranged in the discharge hole 3 along the width direction of the base table 1, and an upper sand blasting pipe assembly arranged along the width direction of the base table 1 is arranged above the lower sand blasting pipe assembly in the sealing cover 2; the sand pushing plate 6 arranged along the width direction of the base table 1 is connected to the inner wall of the sealing cover 2 through a telescopic rod 5 arranged along the vertical direction, and the sand pushing plate 6 is located above the discharge hole 3 and on one side of the upper sand blasting pipe assembly.
The pressed sealing plate 4 is pushed into the sealing cover 2 from one material hole, the sealing plate 4 passes through the upper sand blasting pipe assembly and the lower sand blasting pipe assembly to enable the top surface of the sealing plate 4 to be in contact with the bottom of the sand pushing plate 6, the rear sealing plate 4 penetrates out of the other material hole, sand blasting work is simultaneously carried out on the top surface and the bottom surface of the sealing plate 4 through the upper sand blasting pipe assembly and the lower sand blasting pipe assembly, and gravel sprayed by the lower sand blasting pipe assembly is discharged from the material hole 3 after the bottom surface of the sealing plate 4 is processed; the gravel sprayed by the upper sand blasting pipe assembly processes the top surface of the sealing plate 4 and finally scrapes the gravel into the discharge hole 3 through the sand pushing plate 6 to be discharged; simultaneously through the closing plate 4 in the material hole and the top surface of base platform 1 offset, come to seal material hole department, avoid carrying out the sandblast work in, the gravel is from material hole splash.
Example 5
Further carrying out structural optimization on an upper sand blasting pipe assembly and a lower sand blasting pipe assembly, wherein the adopted upper sand blasting pipe assembly and the adopted lower sand blasting pipe assembly are identical in structure and are symmetrically arranged, the upper sand blasting pipe assembly comprises a sand blasting adjusting pipe 7 arranged along the width direction of a base table 1, two ends of the sand blasting adjusting pipe 7 are sealed, the bottom of the sand blasting adjusting pipe 7 is uniformly distributed and communicated with a plurality of spray heads 8 along the length direction of the sand blasting adjusting pipe, and an adjusting structure is arranged between the sand blasting adjusting pipe 7 of the upper sand blasting pipe assembly and the sand blasting adjusting pipe 7 of the lower pipe assembly for sand blasting; the adjustment structure is used to control the use of the plurality of nozzles 8 of the upper and lower sand blast pipe assemblies.
When the fiber boards with different widths are pushed into the sealing cover 2 for sand blasting, the using conditions of the plurality of spray heads 8 of each sand blasting pipe assembly are adjusted through the adjusting structure, so that the fiber boards are subjected to sand blasting more efficiently; when the width of fibreboard is less, reduce the use quantity of shower nozzle 8, avoid causing the waste of kinetic energy, when the width of fibreboard is bigger, increase the use quantity of shower nozzle 8 to make the fibreboard can be complete, swift carry out sandblast processing.
Specifically, the adopted adjusting structure comprises adjusting parts and a driving part, wherein the adjusting parts are arranged in a sand blasting adjusting pipe 7 of an upper sand blasting pipe assembly and a sand blasting adjusting pipe 7 of a lower sand blasting pipe assembly, the driving part is connected between the two adjusting parts, the middle part of each sand blasting adjusting pipe 7 is communicated with a feeding pipe, each adjusting part comprises an adjusting screw rod 9 which is rotatably arranged in the sand blasting adjusting pipe 7 along the axial direction of the adjusting screw rod and a breaking adjusting block 10 which is slidably clamped at the two ends in the sand blasting adjusting pipe 7 along the axial direction of the adjusting screw rod, and the two breaking adjusting blocks 10 are in threaded connection with the adjusting screw rod 9; the drive section is connected to a regulating screw 9 in each regulating section.
The two adjusting screw rods 9 are synchronously rotated through a driving part, so that the two disconnected adjusting blocks 10 connected to each adjusting screw rod 9 move towards or away from each other; when the two disconnected adjusting blocks 10 connected to each adjusting screw 9 move in opposite directions, the space between the two disconnected adjusting blocks 10 in each sand blasting adjusting pipe 7 is in a conducting state, the spray heads 8 communicated with the space can perform sand blasting normally, and the spray heads 8 communicated with the spaces with two ends not conducted on each sand blasting adjusting pipe 7 are not communicated and cannot perform sand blasting; when the two disconnecting adjusting blocks 10 connected to each adjusting screw 9 move away from each other, the size of the space in the conducting state in each sand blasting adjusting pipe 7 is increased, so that more spray heads 8 are communicated; therefore, the number of the spray heads 8 in the conducting state on each sand blasting adjusting pipe 7 is adjusted to adapt to fiber boards with different widths so as to meet different requirements.
The drive portion of adoption is including rotating the driven pulleys 12 that equal fixed connection on drive pulley 11 and every accommodate the lead screw 9 that set up on the 2 outer walls of sealed cowling, and driven pulleys 12 all rotates the setting on 2 outer walls of sealed cowling, links to each other through same belt drive between drive pulley 11 and every driven pulleys 12.
Rotate drive pulley 11 and make two driven pulleys of belt drive 12 synchronous rotation to make two accommodate the lead screw 9 synchronous rotations, make the sandblast regulating tube 7 of going up the sandblast pipe subassembly the same with the shower nozzle 8 quantity of the sandblast regulating tube 7 intercommunication of lower sandblast pipe subassembly, and the shower nozzle 8 one-to-one mutual disposition of intercommunication comes the bottom and the top of while to the fibreboard and carries out sandblast processing.
And the adopted adjusting screw rods 9 respectively comprise a left half section and a right half section which are reversely arranged by screw threads, and two disconnecting adjusting blocks 10 connected on each adjusting screw rod 9 are correspondingly connected with the left half section and the right half section of each adjusting screw rod 9 one by one.
The adjusting screw 9 is designed such that when the adjusting screw 9 is rotated, the two separate adjusting blocks 10 connected thereto can be moved towards or away from each other.
Example 6
Further optimize the structure of pushing away sand plate 6, it has the inclined plane to open in the one side that pushes away sand plate 6 and be close to last sandblast pipe assembly, and the distance between the low end on inclined plane and relief hole 3 is less than the distance between the high end on inclined plane and relief hole 3.
Push away the inclined plane design on the sand blasting plate 6 and be in order to make the fibreboard rather than offseting, messenger that can be quick and push away the telescopic link 5 shrink that sand blasting plate 6 links to each other, make and push away sand blasting plate 6 and move up, the fibreboard makes the bottom that pushes away sand blasting plate 6 offset with the top of fibreboard all the time after passing from the bottom that pushes away sand blasting plate 6, then go up 8 spun gravels of shower nozzle in the sand blasting pipe subassembly and process the back to the top of fibreboard, the gravel scrapes into in the relief hole 3 through pushing away sand blasting plate 6.
Further, a material collecting groove 13 communicated with the bottom of the discharge hole 3 is connected to the bottom of the base table 1 in a sliding manner, so that the processed gravel is discharged from the discharge hole 3 into the material collecting groove 13 to be collected, and the gravel can be reused.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. The preparation process of the moisture-proof fiberboard is characterized by comprising the following steps of:
a, cutting pine, miscellaneous tree and mountain pepper tree into slices by a chipping machine;
b, adding the slices and the mountain pepper leaves into a hot mill for cooking, adding molten paraffin into the hot mill for hot milling and defibrination, wherein the cooking pressure in the hot mill is 8-8.5bar, and the cooking time is 3-4 min; wherein the amount of the mountain pepper leaf is 10% -16% of the amount of the flake, and the addition amount of the paraffin is 7-10kg/m3；
Step c, adding adhesive and epoxy resin in a molten state into the hot-milled fibers, wherein the addition amount of the adhesive is 70-100kg/m3The addition amount of the epoxy resin is 60-90kg/m3；
D, drying the sizing fiber, sorting, paving and forming after drying, and pressing by a press to obtain the sizing fiber;
e, uniformly colliding a plurality of grooves on the surface of the pressed fiber board by adopting a sand blasting machine, and then uniformly spraying a protective layer on the surface of the fiber board;
the sand blasting machine adopted in the step e comprises a base table and a sealing cover arranged above the base table, wherein a discharge hole is formed in the middle of the base table along the width direction of the base table, material holes are formed in the bottoms of two side walls of the sealing cover along the length direction of the base table, and a sealing plate is arranged in each material hole in a sliding mode along the height direction; a lower sand blasting pipe assembly is arranged in the material discharge hole along the width direction of the base platform, and an upper sand blasting pipe assembly arranged along the width direction of the base platform is arranged above the lower sand blasting pipe assembly in the sealing cover; the inner wall of the sealing cover is connected with a sand pushing plate arranged along the width direction of the base table through a telescopic rod arranged along the vertical direction, and the sand pushing plate is positioned above the discharge hole and on one side of the upper sand blasting pipe assembly;
the upper sand blasting pipe assembly and the lower sand blasting pipe assembly are identical in structure and symmetrically arranged, the upper sand blasting pipe assembly comprises sand blasting adjusting pipes arranged along the width direction of the base platform, two ends of each sand blasting adjusting pipe are sealed, a plurality of spray heads are uniformly distributed and communicated at the bottoms of the sand blasting adjusting pipes along the length direction of the sand blasting adjusting pipes, and an adjusting structure is arranged between the sand blasting adjusting pipes of the upper sand blasting pipe assembly and the sand blasting adjusting pipes of the lower sand blasting pipe assembly; the adjusting structure is used for controlling the service conditions of a plurality of spray heads of the upper sand blasting pipe assembly and the lower sand blasting pipe assembly;
the adjusting structure comprises adjusting parts and a driving part, wherein the adjusting parts are arranged in a sand blasting adjusting pipe of an upper sand blasting pipe assembly and a sand blasting adjusting pipe of a lower sand blasting pipe assembly, the driving part is connected between the two adjusting parts, each adjusting part comprises an adjusting screw rod which is rotatably arranged in the sand blasting adjusting pipe along the axial direction of the adjusting screw rod, and two disconnecting adjusting blocks are slidably clamped at two ends in the sand blasting adjusting pipe along the axial direction of the adjusting screw rod and are in threaded connection with the adjusting screw rod; the driving part is connected with the adjusting screw rod in each adjusting part to enable the adjusting screw rods to rotate in the same direction, and the adjusting screw rods rotate to enable the two disconnected adjusting blocks connected with the adjusting screw rods to move towards or away from each other.
2. The process for making a moisture resistant fiberboard of claim 1, wherein: and a, after the step a is finished, screening high-quality slices with the length of 22-28 mm, the thickness of 3-5 mm and the width of 20-24 mm by using a screening machine.
3. The process for making a moisture resistant fiberboard of claim 1, wherein: the adhesive is prepared by reacting excessive melamine with formaldehyde and glycerol in an acidic environment.
4. The process for making a moisture resistant fiberboard of claim 1, wherein: the press in the step d is completed under the following pressure and temperature conditions: firstly, the pressure is increased to 3.5 +/-0.3N/mm within 35-40s2Increasing the temperature to 220 +/-5 ℃, maintaining the pressure for 70-90s, and then reducing the pressure to 3.0 +/-0.3N/mm within 16-18s2Increasing the temperature to 225 +/-5 ℃, maintaining the pressure for 100-2The temperature is reduced to 220 +/-5 ℃, the pressure is maintained for 110-120s, and then the pressure is reduced to 2.0 +/-0.3N/mm within 24-26s2Cooling to 190 + -5 deg.C, maintaining the pressure for 140s, and finally reducing the pressure to 0.6-0.8N/mm within 18-20s2The temperature is reduced to 160 +/-5 ℃, and the pressure is maintained for 200s and 300 s.
5. A process for making a moisture resistant fiberboard of claim 1, wherein: the driving part comprises a driving belt wheel which is rotatably arranged on the outer wall of the sealing cover and a driven belt wheel which is fixedly connected with each adjusting screw rod, the driven belt wheels are rotatably arranged on the outer wall of the sealing cover, and the driving belt wheels are connected with each driven belt wheel through the same belt in a transmission manner.
6. The process for making a moisture resistant fiberboard of claim 1, wherein: the adjusting screw rods comprise left half sections and right half sections which are reversely arranged in a threaded manner, and two disconnecting adjusting blocks connected to each adjusting screw rod are correspondingly connected with the left half sections and the right half sections of each adjusting screw rod one by one.
7. The process for making a moisture resistant fiberboard of claim 1, wherein: the sand pushing plate is provided with an inclined plane on one side close to the upper sand blasting pipe assembly, and the distance between the lower end of the inclined plane and the discharge hole is smaller than the distance between the high end of the inclined plane and the discharge hole.
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